Motor constantly knocking
Senior Member
Joined: Jan 2021
Posts: 761
Likes: 288
i can tell, there is noticeably no pinging under load as there is with 87.
Senior Member
Joined: Mar 2021
Posts: 4,798
Likes: 2,396
[QUOTE=Jinaling;7600582]here’s that video
In the cab, parked and idling.[
The Video is at Idle, the noise is normal background for this engine. A modified Mustang engine for truck use. Nothing like the old push rod engines. Now you have 4 cams and 32 valves and 4 chains running that makes extra noise.
The high pressure fuel pump has its own wider spaced ticking noise that is sometimes louder than other times. Its on the passenger side middle of the Valve cover, covered with a Rubber Boot and driven off an Exhaust cam Lobe.
The rest of the engine is the front Cam drive chains running over the Cam sprockets. My engine is so quiet now I can hear the chains. That type drive always makes the same noise with 4 chains. 2 long ones and two short ones.
The Valve covers are Composite material and don't attenuate noise very well.
Fuel Octane has nothing to do with it at Idle.
In my cab, cannot hear the engine but look at the Tach to tell if running at 600 rpm, as usual..
Even Momma says she can't hear or feel the motor running it's that smooth.
No worry.
Good luck.
In the cab, parked and idling.[
The Video is at Idle, the noise is normal background for this engine. A modified Mustang engine for truck use. Nothing like the old push rod engines. Now you have 4 cams and 32 valves and 4 chains running that makes extra noise.
The high pressure fuel pump has its own wider spaced ticking noise that is sometimes louder than other times. Its on the passenger side middle of the Valve cover, covered with a Rubber Boot and driven off an Exhaust cam Lobe.
The rest of the engine is the front Cam drive chains running over the Cam sprockets. My engine is so quiet now I can hear the chains. That type drive always makes the same noise with 4 chains. 2 long ones and two short ones.
The Valve covers are Composite material and don't attenuate noise very well.
Fuel Octane has nothing to do with it at Idle.
In my cab, cannot hear the engine but look at the Tach to tell if running at 600 rpm, as usual..
Even Momma says she can't hear or feel the motor running it's that smooth.
No worry.
Good luck.
Last edited by Bluegrass; May 21, 2024 at 04:42 PM.
Thread Starter
jingalingjingaling
Joined: Apr 2024
Posts: 53
Likes: 11
From: NC
[QUOTE=Bluegrass;7600923]
Theres the one, thank you sir!
here’s that video
In the cab, parked and idling.[
The Video is at Idle, the noise is normal background for this engine. A modified Mustang engine for truck use. Nothing like the old push rod engines. Now you have 4 cams and 32 valves and 4 chains running that makes extra noise.
The high pressure fuel pump has its own wider spaced ticking noise that is sometimes louder that other times. Its on the passenger side middle of the Valve cover, covered with a Rubber Boot.
The rest of the engine is the front Cam drive chains running over the Cam sprockets. My engine is so quiet now I can hear the chains. That type drive always makes the same noise with 4 chains. 2 long ones and two short ones.
The Valve covers are Composite material and don't attenuate noise very well.
Fuel Octane has nothing to do with it at Idle.
In my cab, cannot hear the engine but look at the Tach to tell if running at 600 rpm, as usual..
Even Momma says she can't hear or feel the motor running it's that smooth.
No worry.
Good luck.
In the cab, parked and idling.[
The Video is at Idle, the noise is normal background for this engine. A modified Mustang engine for truck use. Nothing like the old push rod engines. Now you have 4 cams and 32 valves and 4 chains running that makes extra noise.
The high pressure fuel pump has its own wider spaced ticking noise that is sometimes louder that other times. Its on the passenger side middle of the Valve cover, covered with a Rubber Boot.
The rest of the engine is the front Cam drive chains running over the Cam sprockets. My engine is so quiet now I can hear the chains. That type drive always makes the same noise with 4 chains. 2 long ones and two short ones.
The Valve covers are Composite material and don't attenuate noise very well.
Fuel Octane has nothing to do with it at Idle.
In my cab, cannot hear the engine but look at the Tach to tell if running at 600 rpm, as usual..
Even Momma says she can't hear or feel the motor running it's that smooth.
No worry.
Good luck.
Junior Member
Joined: Apr 2024
Posts: 7
Likes: 1
I have the 5.0 and used to run the 89 octane at Sam's Club. Worked well for a while, then the knocking started. Tried Wawa and others 89 and same results. So I just suck it up and buy the 93 at Sam's Club because that knocking annoys me (I do a lot of city driving; on the highway I use lower octane). Funny thing, just read in the manual today (RTFM!) that 91 octane is suggested. So I'm thinking every other time I will use the higher octane and see how that works.
5 Year Member
Joined: Jul 2013
Posts: 190
Likes: 11
From: Georgia
I've been reading the threads about the knocking/pinging. Just got back from a 1000 mile round trip and noticed a lot of pinging when in the 1500-2000 rpm range. It wouldn't last long as I assume the knock sensor was kicking in but from what I read I shouldn't be hearing it all on any type of fuel???
Was running 87 the first part of the trip and E85 on the way home.
Didn't notice much if any pinging with the E85. I just turned 36K on the truck, 2018 5L.
Was running 87 the first part of the trip and E85 on the way home.
Didn't notice much if any pinging with the E85. I just turned 36K on the truck, 2018 5L.
Senior Member
Joined: Mar 2021
Posts: 4,798
Likes: 2,396
I've been reading the threads about the knocking/pinging. Just got back from a 1000 mile round trip and noticed a lot of pinging when in the 1500-2000 rpm range. It wouldn't last long as I assume the knock sensor was kicking in but from what I read I shouldn't be hearing it all on any type of fuel???
Was running 87 the first part of the trip and E85 on the way home.
Didn't notice much if any pinging with the E85. I just turned 36K on the truck, 2018 5L.
Was running 87 the first part of the trip and E85 on the way home.
Didn't notice much if any pinging with the E85. I just turned 36K on the truck, 2018 5L.
In low RPM cruise, only the normal load of the vehicle, not Towing, there should be no Pinging or Knock.
You really don't know what it might be unless you can see the Ignition Timing too far advanced on a Scan display, while its happening.
When changing from low Octane fuel to E85, it takes at least 50 miles or more for the Program to shift the fuel tables richer for that fuel.
Reason is, the mix of the two fuels has to stabilize, then the fuel tables stop shifting and settle at the prevailing fuel mix as it comes out of the fuel line.
Another reason the fuel has to be adjusted for is the specific gravity of the fuel with Eth is higher and produces more oxygen in the exhaust gas the Ox Sensors detect and causes the tables shift for A/F corrections.
There is no instant change when changing fuels, it takes time for the program to shift because there is no dedicated fuel sensor located in the fuel flow line.
The Knock Sensor is immediate acting on the Ignition table to cause retard until it does not detect block or head ringing. It is a Tuned Sensor to respond only to that engine family application it is used on. The Sensor is normally a Crystal that generates a voltage directly from mechanical vibrations is senses from being mechanically distorted.
Good luck.
5 Year Member
Joined: Jul 2013
Posts: 190
Likes: 11
From: Georgia
.
In low RPM cruise, only the normal load of the vehicle, not Towing, there should be no Pinging or Knock.
You really don't know what it might be unless you can see the Ignition Timing too far advanced on a Scan display, while its happening.
When changing from low Octane fuel to E85, it takes at least 50 miles or more for the Program to shift the fuel tables richer for that fuel.
Reason is, the mix of the two fuels has to stabilize, then the fuel tables stop shifting and settle at the prevailing fuel mix as it comes out of the fuel line.
Another reason the fuel has to be adjusted for is the specific gravity of the fuel with Eth is higher and produces more oxygen in the exhaust gas the Ox Sensors detect and causes the tables shift for A/F corrections.
There is no instant change when changing fuels, it takes time for the program to shift because there is no dedicated fuel sensor located in the fuel flow line.
The Knock Sensor is immediate acting on the Ignition table to cause retard until it does not detect block or head ringing. It is a Tuned Sensor to respond only to that engine family application it is used on. The Sensor is normally a Crystal that generates a voltage directly from mechanical vibrations is senses from being mechanically distorted.
Good luck.
In low RPM cruise, only the normal load of the vehicle, not Towing, there should be no Pinging or Knock.
You really don't know what it might be unless you can see the Ignition Timing too far advanced on a Scan display, while its happening.
When changing from low Octane fuel to E85, it takes at least 50 miles or more for the Program to shift the fuel tables richer for that fuel.
Reason is, the mix of the two fuels has to stabilize, then the fuel tables stop shifting and settle at the prevailing fuel mix as it comes out of the fuel line.
Another reason the fuel has to be adjusted for is the specific gravity of the fuel with Eth is higher and produces more oxygen in the exhaust gas the Ox Sensors detect and causes the tables shift for A/F corrections.
There is no instant change when changing fuels, it takes time for the program to shift because there is no dedicated fuel sensor located in the fuel flow line.
The Knock Sensor is immediate acting on the Ignition table to cause retard until it does not detect block or head ringing. It is a Tuned Sensor to respond only to that engine family application it is used on. The Sensor is normally a Crystal that generates a voltage directly from mechanical vibrations is senses from being mechanically distorted.
Good luck.
I'm definitely getting some pinging while cruising along not towing and I gently raise the rpms when using 87. I'm gonna try to run E85 a full tank next fill up and see how it does. However, from your posts I've read, I should be able to run 87 and not have any pinging under normal driving conditions, correct?
Senior Member
Joined: Mar 2021
Posts: 4,798
Likes: 2,396
I have run E10, E15 and E85 all from the same station and no pinging.
Maybe low fuel pressure. That can cause a Pinging from a Lean mixture that would show up in the LTFT as shifted Rich trying to make up for lack of enough fuel..
Good luck..
Maybe low fuel pressure. That can cause a Pinging from a Lean mixture that would show up in the LTFT as shifted Rich trying to make up for lack of enough fuel..
Good luck..